Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2956080bd40800…

MALICIOUS

PDF

75.3 KB Created: 2021-05-17 17:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d9515c11a1a04ffe79c89c930f6aadc9 SHA-1: 48ed52ee695e8b5485fbc5c4cef3e1fe638e13c0 SHA-256: 8e2956080bd408008f993032d7b9740b132ace2d27b0db488bf06ddf5293a2c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=sony+dcr-sx63+memory+card PDF link annotation
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/wafepumafo_duvaji_xuvuwonetaviso_vulurig.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/assembly_language_for_x86_processors_7th_edition_solution_manual.pdfIn PDF document text
    • http://fozivot.mypressonline.com/vibuwevoxuxalevog.pdfIn PDF document text
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/zusomin_dasamasafi_jelux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_57d8efdf77d044308626f261a82a6b5b.pdf?index=trueIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_737167e541d44ebcb3e4b80a722a5d92.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_489b157ab550415098816422cefce397.pdf?index=trueIn PDF document text
    • http://masemipeba.myartsonline.com/student_behavior_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/85216857735.pdfIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_78da26f0c9d347f79442a613f80c7d08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jebokizez/ptolemy_geography.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/algebra_de_baldor_original_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb760824-3692-4b0b-9f24-78a9f1708836/how_to_study_physiology_in_medical_school_reddit.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_75b59ba7b446418f947b4a7468619aaa.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_388a8bfe15ba41439438d48dbf635afe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e990b4-50e1-47eb-b3fe-68247532f428/list_of_all_junie_b_jones_books_in_order.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 5676 bytes
SHA-256: c7a162e2dfb01c838335c46040a0e6c89793c22fca490bc587bb108d210cab54
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 10620 bytes
SHA-256: 9b4ad6d097d6ebc3009c83eb2634413883815bb68a5b70f0c2b1aef36c2abcb8

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